The Largest Planetary System that Could Exist

[@astrumspace]

Special thanks to Lara Reading for helping me with the science behind this video!

[@windowsxpmemesandstufflol]

Astrum hi I’m 59 seconds in the future

[@Hermes_Agoraeus]

Since the heliosphere is mentioned in the video, can you tell us its largest possible size (relative to our sun)?

[@MasonGunneson]

Too bad no one helped you with the Metric system... Enough quoting distances in miles already. Get with the SI units and leave that nonsense alone.

[@ZeroOskul]

There is only one Solar System, it is the planetary sytem that orbits Sol. What the Hell other Solar Systems are you talking about? That's like pointing at a whale and saying that's how big humans can get. A planetary system or star system other than that orbiting Sol IS NOT a Solar System any more than a whale is a big human. Learn English and THEN AFTER LEARNING competently express in English. You make the whole species stupider by authoritatively being wrong.

[@ZeroOskul]

@@bragginrites8586 Look Up General Relativity. Shut up about Newtonian Gravity, it is an illusion debunked by Einstein who replaced it with General Relativity. Your question makes no sense because Gravity does not exist, because Einstein debunked it a century ago.

[@AdrianXpression]

The incomprensible scale and distance is as haunting as it is fascinating

[@libertyprime69]

Astrum has a video where he depicts the Sun as a grain of sand and then proceeds to drive to the nearest star, which- on the same scale, is 30 km away.

[@pipsamuels5578]

Lmao I shouldn't be surprised to see my fave here but I am!

[@zaugitude]

Well said - CheerZ!

[@sonofgodsdad3227]

Also the fact that we are currently chilling inside this insanity...

[@sunnyjim1355]

Not really, because as it's incomprensible far away, then it's not haunting.

[@antman2826]

I didn’t realise that gravity had a near infinite reach. In a universe with only two bodies they would still be in orbit no matter how far they were from one another. Fascinating

[@Redtear]

@Ant Man What is amazing is Gravity is the "weakest" force in the universe. Longest reach however least magnitude. Pretty mind blowing!

[@KomsoMango]

Why? It is also part of Fabric of space-time pulling as a representative as "gravity". So this theory is the answer!

[@LisaAnn777]

Yeah there's no such thing as "zero* gravity. Everything in the universe effects each other in some way.

[@DirtyBobBojangles]

I mean I understood that when I was 5. It's a fairly basic concept...

[@sidpomy]

They may affect each other gravitationally, but if they’re far enough apart for dark energy to come into play, they couldn’t be considered in any sort of orbit I don’t think. Things far enough apart can be causally unlinked by the expansion of the universe.

[@timsmith6675]

As a happy, single introvert, I watch an extremely large content of science videos. I think the quality of your graphics/illustrations and information is comparable to National Geographic and PBS Nature. That's why your videos are such a treat for us science enthusiasts. 😃

[@metametodo]

I wholeheartedly agree. I was just now, by the start of the video, thinking about how the work done on this channel has great educational qualities, and that it emanates passion and incites curiosity very well on us viewers. That's the best thing a scientific divulgation channel can offer in my opinion.

[@SocksWithSandals]

I'm married, and my wife had no idea that Venus was a twin of Earth, or that Jupiter has clouds and moons. She was in awe that everyone's dawns and sunsets could turn the Moon red.

[@lostsquirrel788]

Check out sea chanell

[@romanempire1405]

I Dont Like To Watch. I Like To Read

[@ActuallyAndre]

@@romanempire1405 cool, but who asked?

[@MrTortugaa]

I just hope we someday make it out there.

[@epicn]

I want to at least visit mars one day

[@belstar1128]

Maybe 1000 years from now

[@hypnocilicdreams]

I hope to party on Pluto or at very least, dance in space

[@oceanlawnlove8109]

we'll prolly be extinct b4 that

[@idcgaming518]

As much as I'd like to be an optimist... yeah, you're probably right.

[@kamalkhan5305]

The Oort Cloud is a fascinating region.

[@sunnyjim1355]

I've never heard it refered to in that way before.

[@michaellidster1389]

If you tell the right stories about it , it can be fascinating

[@yoshikhurazi1769]

There could be dozens of planets in that space of comparable mass to Mars or even Earth plus potentially hundreds more like Pluto or Eris. We just have no way of knowing till we can actually observe there but even assuming a lower end projection of 4 earth masses worth of matter being out there, that's more than enough for quite a few planetary scale bodies.

[@dazza2350]

Agreed, Kamal!

[@dumbledor22]

"i" always thought it's called the "oppik" oort cloud.

[@2ndAveScents]

I think one of the reasons I love Astronomy and Cosmology so much is because it makes some of the small petty and annoying things I deal with on a daily basis feel that much smaller, and even bigger problems feel insignificant against the backdrop of the unfathomable size and scale of the universe we live in. It makes it easier to put away all those unreasonable fears and worries at night and fall asleep, reset and come at the world with a better outlook the next morning. That’s probably why I watch videos like this every night. David Butler is one of my favorites.

[@summersky77]

I just want to thank this channel for creating amazing content and for making it available on KZbin. I don't think that gets said enough and many of us take for granted that it's freely available on this platform.

[@tomfieselmann5906]

That image at 6:09... I understand it completely, but it's fascinating. Can you delve into that in a complete episode?

[@lightspeed9762]

It reminds of the view of packed cells in biological tissues like skin for example :D

[@axelgrabalos8769]

@@lightspeed9762 thought exactly the same

[@Derek_Gunn]

What do the glowing bits mean?

[@rilluma]

@@Derek_Gunn i think there is multiple hill-spheres on top of each other so the object would be under the influence of multiple hill spheres

[@GolddenWaffles]

Derek Gunn Yes, Overlapping Hill Spheres

[@TheRealGuywithoutaMustache]

So star systems vary in size quite a bit, our universe in general is just filled with so many fascinating things it's unreal

[@N0Xa880iUL]

Very informative video! Nicely done!

[@craigmichaelcurtice3013]

Cuz this channel rocks it's professionally done with heart

[@smallstudiodesign]

Thanks for pointing out how the limit of gravitational pull is called a “hill sphere”.

[@BongLeach]

Thank you. In all my years I've never heard of the "hill sphere"!

[@LordLOC]

Maybe you've heard of the other term used for Hill Sphere, the Roche Sphere (and this is not related in any way to the Roche limit or Roche Lobe, which are different things altogether?

[@ralienpp]

Same here. I see it as a Voronoi polygon, but in 3D :-)

[@21megawatts92]

It can be also called the Sphere of Influence!

[@thomassosby9068]

I do believe the term the poster is using is the heliosphere. I could be wrong though.

[@mochiyeosang1908]

@@thomassosby9068 no, thats completely different.

[@annoyed707]

How do multi-star systems compare in size?

[@Madhijz]

Was hoping for that to come up aswell

[@astrumspace]

I was thinking of doing a seperate video on that :)

[@sunnyjim1355]

Their combined mass is obviously going to be bigger than other solar systems with less singular/combined mass. Next.

[@Sashil01]

@@astrumspace *separate 🧐👓🎓 Best check oneself before one wrecks oneself 🦉 YW

[@xaj1543]

@@Sashil01 Best stop oneself, before ones rap, embarrasses oneself. 🤔🤦🏾‍♂️🤷🏾

[@kevanhubbard9673]

I always feel sorry for pioneer 10 and 11 they're leaving the solar system too, and New horizons,but no body ever mentions the poor old pioneers.

[@Inside.Frame1]

Pioneer 10 sent its last signal to Earth in January 2003, Pioneer 11's last transmission was received on September 30, 1995, New Horizons is still in the Kuiper Belt.

[@jimmytheshadowleviathan7243]

I mean, no one mentioned like 90% of the other astronauts that went to the moon other than neil armstrong and buzz aldrin, because being the first to do something extraordinarily hard is a lot cooler than doing it later

[@ximalpopoca735]

... I miss them the most... maybe in the far future with a far out tech we'll recuperate them as monuments of freedom and adventure...

[@renejean2523]

@@ximalpopoca735 - Maybe. But they're hurtling away from us at 35,000 mph, so the sooner the better really. Hell of a trip for a museum piece though.

[@coletrain411]

@@ximalpopoca735 stellaris player?

[@ChronicNewb]

The existence of the oort cloud makes me feel pretty special being so close to our star.

[@tuatha1337]

An "effectively" infinite distance between two bodies should be possible due to cosmological expansion, right? The strength of the gravitational force would weaken and approach zero kind of like how light waves redshift as the object approaches the cosmological horizon. So the 'orbit' would look more like a hyperbola approaching a straight line?

[@astrumspace]

Only in an expanding universe. For the universe to be expanding, we think there would also need to be dark energy. It's really a hypothetical example anyway :)

[@richardhauer8391]

​@@astrumspace True, but the math to include the expansion would be quite simple: If we assume the expansion of the universe is 70km/Mpc everywhere, our sun's influence would end where the accelerations of gravity in free fall and acceleration from the expansion cancel out. That happens at only about 800Lj in an otherwise emty environment. (an ejected star from a galaxy for example) r=sqrt(m*G/H) from G*m/r^2=H with G as gravitaion konstant, m the solar mass, r the distance and H the Hubble constant, if I didn't make a mistake here.

[@michaelskywalker3089]

Also, if the universe contracts and expands semi-chaotically then a reasonable guess at the largest solar system to ever be in existence might depend on a fractal calculus that would determine a probable maximal distance between bodies. Interestingly, an "orbit" might exist in terms of fractions of a second and be felt as a murmur across the expanse of the cosmos by the orbiting body.

[@darth856]

Fascinating. We have discovered some objects, such as Sedna, with elongated orbits that takes them very far away from the sun. Not nearly as far away as one light year though.

[@jonathancumplido4902]

I've been on a space video binge and you're definitely one of my main choices for content like this. It's so educational!

[@Trainwizard]

Stellardrone's Eternity makes my soul melt every time I hear it! Amazing choice of soundtrack for a great video.

[@timmcguire6436]

Your videos are getting better all the time! I learn with each one. Thank You

[@John-oe5nb]

Me: "Wow, that's a long way". Infinity: "Hold my beer."

[@libertyprime69]

"Hold my figure eight.... sideways."

[@sunnyjim1355]

@@libertyprime69 NPC Rich Smith: report back to Maintenance Division for recalibration. Immediately.

[@daos3300]

meme: tired everyone: jaded

[@badhombre4683]

Another mind bending, humbling, and enlightening experience Astrum. Your videos are as informative as they are thrilling. I salute your work and nominate you for the narrator of the next Cosmos series.

[@jackthelad9933]

Well said!

[@RandyJames22]

Escape velocity: the pressure of one photon.

[@sunnyjim1355]

photons don't have mass, so cannot inert pressure.

[@Googaliemoogalie]

@@sunnyjim1355 because photons carry energy, they also follow the law of conservation of momentum. So since photons have momentum, it can totally have radiation pressure. This is how light sails work

[@Googaliemoogalie]

Escape velocity on earth is too much for photons to provide energy for. Unless you have death Star type lasers I suppose. Think about how much a mirror would recoil of you pointed a flash light at it. It's so small it wouldn't amount to anything

[@michaelskywalker3089]

Statement intrigues as reasonable equivocation. The minimum escape velocity of the smallest and most common gauge particle depends on the minimum or threshold of radiative pressure this single photon can exert. Since photons have zero rest mass then the minimum amount of force required depends on the threshold of kinetic energy. If the photon does not meet this kinetic energy minimum then it cannot escape a given gravity well. ........ Take the interior of our solar system's star, Sol for example. It is famously noted that photons from the interior cannot exit the surface for centuries, but what if a photon had a high enough momentum to escape the radiative pressure surrounding it as well as the gravitational well and nuclear convection pressure [magnetic flux etc] . If the velocity vector pointed up this high energy photon might escape the Sun in a single instant!

[@ChadDidNothingWrong]

@@sunnyjim1355 energy has a mass equivalent.

[@playahship5786]

Wishing you all abundance of love and knowledge. Remember, where you go, wherever you are, always know! someone you don't know is wishing you the best.

[@annaliseoconner9266]

Thank you for such a lovely comment during this time. Best wishes of health and happiness to you as well.

[@slowfudgeballs9517]

Not sure about the billion light-year solar system. Is this including how the universe's expansion can overcome gravity?

[@Schizniit]

Technically it's incorrect to say "solar systems" in plural, since there is only one solar system. The correct way to say this in plural would be "star systems" because there's only one star named "sol" which is why we call it "the solar system" and alpha centauri would be "the alpha centauri system" and so on

[@rufusapplebee1428]

Live Forever and Prosper, Astrum.

[@mkivy]

This channel places so much in perspective…Eg the vastness of our solar system. And the vastness of our universe!

[@MrVipinb]

That background music that starts at around 0:55, is Eternity by Stellardrone!!! Gosh, I love that track!

[@cian.14yearsago15]

8:07 fascinating to think you can. Never escape the gravity of someyhimg even if it’s on the opposite end of the universe

[@creativedesignation7880]

That is technically true. While the effect will become too small to notice at one point and usually even more quickly be outdone by other gravitational influences, there is no point at which the gravitational field of any object is zero. (The reason in formula is that the gravitational force between two masses is calculated by multiplying the gravitational constant with the product of the two masses involved, divided by their distance and you can never get a value of zero by dividing.)

[@PouncingAnt]

@@creativedesignation7880 Yeah, but space is expanding, so you only need to place the two objects far enough apart that the expansion of space counteracts the attraction of gravity

[@maryann2628]

@@PouncingAnt but before the distance is too far any little movement even a dust touches it the velocity allow it to escape it if that was the sun gravity 1,000 light years without other objects besides the orbiting it and the expansion of the universe then the orbital velocity is only 3.7 meters per second and the escape velocity is 5.8 meters per second so if you run or push it or throw it if its small at almost 2 or more meters per second then it escaped the sun gravity and you could almost escape it by jumping 1.5 meters per second.

[@d4rk0v3]

I see an Astrum notification, I click.

[@GururajBN]

Your description of the solar system is as fascinating as the universe itself! I realised that I have read and heard more about galaxies and galactic clusters and black holes than about the solar system beyond Pluto. Very instructive video. 👌

[@Deadeye313]

In the last example, if the universe is expanding, would there be a point where the expansion of the universe itself overcomes the pull of gravity?

[@jackgeist3803]

Yes. This is the current working theory behind the heat death of the universe. Entropy will increase to 100 percent and no energy will be generated any longer.

[@adm0iii]

Technically, the definition of the hill sphere isn't affected by the expansion of the universe. However, at distances beyond thousands of light years, the definition of the hill sphere has little effective meaning for multiple reasons, such as orbit times exceeding the age of the universe, which is coupled with its expansion.

[@jackgeist3803]

@@adm0iii at parts of the universe, the rate of expansion has already reached velocities that make it, theoretically, physically impossible to catch up to those expanding parts.

[@maryann2628]

depends of the mass for galaxies its millions light years to billion light years

[@mrfumagalli]

Thanks!

[@russellst.martin4255]

Whoever does your art/animation is really talented.

[@ekarae.ntonoba1370]

This has to be my favourite video from you. Thank you

[@ravenlord4]

This is a really cool perspective. So basically achieving escape velocity from one body just means that you are then simply under the gravitation pull of another. Trading one master for another.

[@jonasrosengren9093]

Another of your amazing videos - Thanks for sharing this Alex.

[@daos3300]

the mind boggles not at the beauty of our universe, but at the inanity of yt comments

[@peterhumphreys9201]

...and it's the same on almost every video. Some people must have been born just to be stupid on KZbin.

[@iamdmc]

ASTUM QUESTION: Would it be possible to have a solar system outside of a galaxy, and if so what are the challenges to us ever finding it? You inspired this thought in your video where you said "stars could be ejected outside of their galaxy" - and presumably the planets that orbit it may be ejected as well, although their orbits would likely be perturbed

[@astrumspace]

It's very conceivable!

[@iamdmc]

@@astrumspace I love your channel by the way! I've learned a lot. I'm a neuroscientist but always wished I was good at math so I could be an astrophysicist

[@deadworld66]

Imagine if we humans could feel the speed that we're really moving at on this ball of rock. 🌎💨💨💨

[@sk-sm9sh]

Careful of what you wish. We can only feel speed when we come into contact with objects that move through space in different speed than ours. Earth goes 110 000 km/h around the sun. I personally would rather hope I never come anywhere close to anything that is going on this order of speed but in different direction than me.

[@coletrain411]

@@sk-sm9sh careful mixing up imagining something with wishing for it.

[@shadezman]

You can't feel the speed if your speed is constant

[@coletrain411]

@@shadezman the keyword in his comment was imagine. You’re welcome❤️

[@sk-sm9sh]

@@shadezman you're confusing feel of acceleartion to feel of speed. We feel speed by either seeing objects fly past us or by feeling the wind blown in our face. For example a convertible goes on highway, in constant speed, would you say that you don't feel the speed?

[@louf7178]

6:10 coolest picture - solar systems' Hill spheres

[@WrestlingRecapCentral]

I love this Channel... keep up the good work... keep bringing great content.. I love these kinda stuffs

[@johnmcnulty4425]

You're the best astronomy educator we have today!

[@Reeceeboy]

I'd say a good measurement would be the furthest object that is spherical, orbits the sun stabally, has gravity and originated from our sun

[@tracy449]

I just discovered your channel. Love this content!

[@boblee5524]

Excellent!!! Thank you.

[@IvanoForgione]

Wow, I've been watching suggestive and informative videos about cosmology and astrophisycs for years now, and only now I find you in the suggestions, for some reason. Thankfully! This video is a small masterpiece.

[@klausgartenstiel4586]

8:10 the expansion of the universe could come into play there, though.

[@PouncingAnt]

Good point! It would have been nice to have an idea of the radius at which the expansion of the universe counteracts gravity for a given set of masses

[@klausgartenstiel4586]

yes, that's true. so expansion is actually not a probelm. 🙄

[@anyakesakesa7395]

Before people say space is empty but now after learning from some KZbin videos, space is becoming mighty exciting to me. Thanks for the videos.

[@simonesanchi300]

Please change the background music on your next video. I always almost fall asleep while I'm watching it.🙈😂 Great Video though!

[@DR-mp4gv]

You need more sleep then.☺

[@simonesanchi300]

@@DR-mp4gv I prefer watching Astrum;)

[@eduardjsx]

What sets Astrum apart is his calm videos (in my opinion). It’s almost like ASMR ... so I watch his videos when I am about to go sleeping :) Helps a lot!

[@simonesanchi300]

@@eduardjsx Great Idea! Makes absolutely sense.:) But in a way, for Astrum it's quite contrproductive, because it prevents me from watching more of his videos because i fall asleep.;)

[@zeldededeab9966]

You should really be proud of the quality content you put out!

[@adambond5983]

Great epsiode!

[@MArDeNPeRes]

Your videos are getting better and better...congrats!!! :0*

[@Vivaswaan.]

This was an intriguing topic to learn about. Thank you!

[@VoyagerLife826]

Absolutely love your videos Astrum keep up the good work

[@DR-mp4gv]

Playing Stellardrone for this. Perfect👍

[@obrecht72]

Just happened to find this jem in my feed. I think the mind blowing beauty in this video compliments the mind blowing beauty of the universe as we know it. Great work.!

[@catchableorphan]

In a universe with one star and one orbiting object. The object would not need to be "infinitely" far away to escape, it would only need to achieve a distance that would put over the "cosmic horizon" assuming this made up universe is expanding like our own.

[@SpecialEDy]

Gravity could still be acting at that distance. But gravity acts at the speed of light, so would it be more appropriate to say that objects which are moving away from each other at light speed, even if they are still receiving past light and gravity from each other, are no longer gravitational bound, since they are in essence on an escape trajectory?

[@Jason-io2vy]

Without anything else in that universe would there be any dark energy to push space apart? They would probably always be bound to each other.

[@LunaticTheCat]

Very true, the only thing faster than the speed of light is the expansion if the universe.

[@jacobcastro1885]

8:00 only escape is infinite distance? An escape velocity doesn't exist in a 2 bodied universe? I would think an escape velocity could be calculated that is less than the speed of light, certainly less than infinite speed. Unless even at V=infinity-1, at distance = infinity-1 for 2 hydrogen atoms, means that eventually (time=infinity-1) the bodies regroup. [Massive time = massive cumulative effect of gravity causing perpetual deceleration and reversal] Perhaps. Food for thought.

[@catchableorphan]

@@jacobcastro1885 I think it would be determined by the rate of expansion of our two body universe. In the video he doesn't mention an expansion rate for the example solar system. However in the universe we live in we do have a rate of expansion that creates a "cosmic horizon". That horizon can be reached given enough distance or time between two objects that will cause them to become "causally disconnected" and after that they cannot rejoin each other ever again. But you are correct in your assertion if the example universe is static.

[@justdriveon]

Alex, this is by far one of your best yet. 👏👏👏👏👏👏

[@sarahpusey9052]

Love this channel! Beautifully executed every time! Who would be 3 dodo birds that game this video a thumbs down???? Wow!

[@charris5700]

Excellent job Astrum. Great info as usual.

[@CF-cm2ye]

Voyager 1 & 2 will just keep going on and on. I wonder if in the future it would be possible to catch up to them .

[@CF-cm2ye]

Also Stella winds blow me away. I never heard of them. Man my teachers were stupid.

[@omnianima4540]

I think if we wouldnt be able to catch up to them in humanities life time, we will never be able to reach anything outside our solar system, which would be a pretty depressive thought, because just by definition, the speed of the voyagers, probably wouldn't reach anything outside the solar system in humanities life time.

[@maryann2628]

@@omnianima4540 not even the inner oort cloud it takes likes a hundred thousand years for both voyager to escape the sun gravity

[@antonleimbach648]

Your videos are just great. Excellent narration, graphics, subject material, it’s all good bro.

[@SassInYourClass]

Brady Haran is going to be unhappy to learn that the Voyager spacecrafts still haven’t left the solar system.

[@johnroberts2620]

Just subscribed, great stuff👍😎

[@milansajan1001]

*Good♥️Explana†ion.*

[@jamiebarraclough8981]

Great video very engaging

[@SpecialEDy]

A solar system could technically be an entire galaxy or group of Galaxy's. Our sun is orbiting Sagittarius A Star, as is the entire galaxy, and I'd wager that the barycenter of the galaxy lies within the event horizon of Sagittarius A.

[@Jafflefields]

I'm pretty sure Sagittarius A is a supermassive black hole, not a star

[@Nolan_L]

@@Jafflefields the name of the black hole is Sagittarius A*, with the * pronounced as "star."

[@Deeplycloseted435]

The barycenter of our solar system isn’t even inside of the Sun, mostly because of big-ass Jupiter. Maybe one day we can measure the barycenter of the galaxy?

[@raahimhadi4905]

@@Deeplycloseted435 lol

[@grahamhill676]

@@Jafflefields Black holes are stars

[@IceLordHellFire82]

Just crazy interesting! Keep up the good work and great videos👌

[@Shadow77999]

2:15 imagine if we had launched the voyager in the opposite direction, we would have never left the heliopause yet and not even in 100 years lol

[@orkkojit]

That's not exactly how it works 😂😂

[@a59x]

Make no mistake there's an incredible value in all your videos. Thank you.

[@Lyendith]

I always wondered how objects so far away from the Sun could still be suject to its gravity, but once you understand that there's no such thing as a "maximum distance" past which gravity stops to operate, it becomes a bit more clear… basically, the biggest fish around always wins?

[@Daedhart]

Weeeelll...this detail of the video is technically wrong. Or at best, misleading. In a static universe, its true that gravity is infinite, but our universe isnt static; its expanding. Gravity waves, and thus the effect of gravity, move at the speed of light. That means parts of the universe moving away from us faster than light due to space expanding dont exert gravity on us. Everything outside of the observable universe is outside of our gravity, so the border of gravity is the observable universe. Basically, if you cant theoretically see it, your gravity doesnt affect it. Interestingly, this also means that the gravity of an object doesnt affect us instantly, only when its light reaches us. So Earth is being pulled via gravity not to where the Sun is right now, but to the point in space it was 8 minutes ago.

[@astrumspace]

@@Daedhart I can see why you think it was misleading, but in the infinity example, I did specify that only those two objects existed in this hypothetical universe. That means everything that could power its expansion also doesn't exist in this example. I was just trying to keep it simple.

[@Daedhart]

@@astrumspace I totally understand. Very impressed you responded and love your videos! Keep it up!

[@StealthTheUnknown]

Stellardrone seems to be frequented for these sorts of videos. Love stellardrone❤️

[@goonerash]

9:12...you had to click..!

[@mykytakhomenko7950]

Video is perfectly compiled and contains lots of exciting scientific things. And this fantastic music, that pulling thoughts out of Earth to stars perfectly fits space subject... Bravo Alex ! Amazing work !

[@tomhools1605]

So it will take Voyager 100k years to pass Oort cloud, but it would take only 10 years for a space probe to pass Oort cloud if it was powered on atom bombs.

[@CMONCMON007]

Fascinating video friend! Just shows how large the Universe is

[@colorfulnebula]

Lets take a moment to realize how small we are in this expanding universe

[@nikhildeshmukh6851]

Hmm.. And how even smaller things like a VIRUS can effect us too. Universe is amazing. ☺️

[@harshitpandya3276]

Mind blowing video buddy I love astrum

[@UlrichVIII]

if there's one thing i like about humanity it would be the ability to do science. Nice video

[@skaruts]

Nothing tops astronomy in making you feel even smaller and more insignificant.

[@TikiPotion]

Yay another one! I've been binge watching these for two days now

[@litephaze]

Thank you for another great video! You’ve yet to do anything less than super-impressive!

[@angelainamarie9656]

Hill Sphere: not a hill, nor a sphere.

[@R.o.Ro.]

It took KZbin sometime to show me this channel but better late than never. Love it

[@impact0r]

7:58 This is incorrect in an expanding universe (ie. our Universe). The distance does not need to be infinite for gravity to lose its grasp. Because universe is expanding, It just needs to be greater than either causality horizon (extreme case) or the distance at which expansion of space nullifies the gravitational influence - which is a much smaller distance.

[@tghadi]

This channel is simply the best channel for astronomy on KZbin

[@AldenDoble]

This video makes me wonder how humanity is ever supposed to be able to escape the solar system 😔

[@sunnyjim1355]

It's not supposed to.

[@PapaTanGh0stNI9htM4R3S0nMaInSt]

Were working on it tho pal patience will prevail nd we will be exploring and ezploiting our vast abundance of feasibly attainable resources minerals and everything we may need for colonization of all bodies within our vicinity and beyond.

[@joannataylor3089]

Warp drives

[@maryann2628]

half the speed of light its 2 years at near light speed its 1.01 years and thats without time dilation if warp drives exist and are possible then 2 times than c is 0.5 years and 299,792,458 times the speed of c is 0.1 seconds

[@jasong546]

Best channel on the tube

[@kirbymarchbarcena]

V-GER: I have come back from deep space and bring you news EARTHLINGS" How took you so long

[@entropygenerator2646]

I laughed at your joke kirby unit

[@MrBeard-ys9vq]

"Solar wind" is actually the double layer effect of plasma. Space is not an empty void, it is a giant energy field.

[@danieldan136]

I am not sure you can call them solar systems as there is only one Solar System with the Sun in the center. I think it would be more appropriate to call them Star Systems.

[@astrumspace]

Star Systems can also mean multiple stars that orbit each other. I wanted to avoid the confusion there

[@andracoz]

Astronomers have discovered more than 2,500 other stars with planets orbiting them in our galaxy. That's just how many we've found so far.. We have barely scratched the surface as to whats actually out there. True wisdom is knowing you know nothing - Socrates.

[@DragonsAreHungry]

@@andracoz "The more I know, the more I realize how little I know." Don't remember who said that...

[@clown-eating-hippo]

You are correct. Solar system. Sol. Our sun. It's THE solar system.

[@kmatcyk]

Fantastic video. You have given me much to think about. Thank you!

[@AllKindsOfCoolThings]

Alex, I've read that the new Moon (when it's directly between the Earth and the Sun) is pulled by the Sun with more force, than it's pulled by the Earth. Could you please prepare a video on this Earth/Moon/Sun dynamics?

[@mattg8116]

I don't think that's quite true, that would place the moon beyond LaGrange point 1, at least when accounting for orbital mechanics. Both the earth and moon are under considerable gravitational force by the sun, and though the moon orbits the earth, it can also be said that it orbits the sun with earth. Regardless, each time the moon is between the earth and sun is balanced by each time it is opposite to both the earth and sun.

[@ritwikreddy5670]

That's not true. Earth's gravity is multitudes higher than of sun in at that distance

[@rishil6491]

I can already imagine highly advanced humans satting up a mission to recover Voyager 1 and 2 and putting it up in an museum lol

[@CODINE80]

I can already see, a mad max like world and people living on this planet the next century or so... dont ask why, the asnwers are everywhere around

[@Nbrobst]

Y'know I always wonder why people call other star systems "solar" systems when our star is the only "Sol." I know it's the widely accepted name for them, it just seems odd to me.

[@markking002]

T^his is the only reason i clicked on this video

[@hollow-xiii-]

It's widely used but it's wrong so it's not widely accepted.

[@Nbrobst]

@@hollow-xiii- Yeah, that's pretty much my problem with it. I've even seen some contradiction on NASA's website. So I think everyone knows that it's supposed to be star system or even planetary system. Its just the habit of calling them solar systems is dying hard.

[@Googaliemoogalie]

And in movies they call all stars Suns. Star Wars does this all the time.

[@diablo.the.cheater]

actually depends on the language, in Spanish for example, any star that has planets orbiting them is considered a Sol

[@malachycomac5382]

Fantastic mind blowing info.Thanks for sharing in such an accessable manner

[@AvangionQ]

7:40 At what point would dark energy tear the orbit apart?

[@Kirealta]

When we figure that out we'll let you know.